Subsequent Events (Details) In Thousands, except Share data, unless otherwise specified	0 Months Ended	3 Months Ended		0 Months Ended
	Oct. 21, 2011 USD ($)	Sep. 30, 2011 USD ($)	Oct. 24, 2011 EUR (€)	Oct. 21, 2011 Minimum [Member]	Oct. 21, 2011 Maximum [Member]
Subsequent Events [Abstract]
Number of ordinary shares repurchase	1,757,660	3,074,832
Total cost included in repurchase of ordinary shares	$ 50,415	$ 91,088
Business acquisition, cost of acquired entity, purchase price			65,000
Business acquisition, cash to be paid upon closing			60,000
Business acquisition, potential cash payment upon performance based earn-out			5,000
Senior unsecured revolving credit facility	$ 250,000
Maturity date of senior unsecured revolving credit facility	October 21, 2016
Interest rate description	Any borrowings under the facility will bear interest at LIBOR plus 1.25% to 1.50%, depending on the ratio of our consolidated indebtedness to our consolidated earnings before interest, taxes, depreciation and amortization (EBITDA)
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate				1.25%	1.50%
Line of credit facility, unused capacity, commitment fee percentage				0.175%	0.225%